A4 vs A3 Printing: Which Size Should You Choose?

A4 measures 210 x 297 mm. A3 measures 297 x 420 mm. Changing from portrait to landscape swaps the width and height; it does not change the paper size.

A5 is 148 x 210 mm, A4 is 21 x 29.7 cm, and A3 is 29.7 x 42 cm. BizBee's print builder offers A5, A4 and A3 selections.

Choose the size you want to receive, then check that the document layout works at that size.

A4 works well for ordinary reports, letters, agendas and reading copies when the text and tables fit comfortably. It is also convenient when a recipient expects an A4 document or needs to store it with other A4 pages.

Start with the recipient's instructions, then inspect the most crowded page. If a chart legend or table note is already difficult to read, keeping the document on fewer sheets is not a good reason to make it smaller.

Consider A3 when the layout needs additional width or height: a comparison table with many columns, a large process diagram or a planning sheet intended to be read across a desk.

Check how the sheet will be used after delivery. A larger document may be easier to discuss in a meeting but less convenient in a small folder.

For a spreadsheet, try improving the layout before enlarging it. Remove unused columns from the print area, choose a sensible orientation and check the exported pages.

Yes, by scaling it down, but text and images become smaller. With proportional scaling, an A3-to-A4 reduction is approximately 70.7% of the original linear size. A4-to-A3 enlargement is approximately 141.4%.

For an illustrative example, 10-point text reduced to 70.7% becomes roughly 7.1 points. That may be too small for comfortable reading. If the text must remain the same size, reformat the document across more pages rather than relying on reduction.

Avoid stretching a document differently in each direction. It can distort photographs, logos and diagrams.

Use Actual size when maintaining the document's scale is necessary and the paper and printable area can accommodate it. Fit adjusts the page to the printable area and can change the scale.

For a scale-sensitive template or drawing, give clear instructions and verify a known dimension on the physical result before relying on it. Selecting a paper size alone does not confirm that the print is at an exact scale.

Decide whether the whole file should use one output size or whether some pages genuinely need another size. A landscape page can still be A4, so check the PDF's dimensions rather than judging by its appearance.

If separate print sizes are essential, confirm the setup with BizBee before submitting. Explain the page ranges and the order in which you need them assembled.

Example: a report has portrait text pages and one landscape A3 schedule. Reducing the schedule to landscape A4 uses about 70.7% linear scale; 10-point table text becomes about 7.07 points. Keeping the schedule A3 retains its intended type size, but creates a mixed-size assembly requirement.

A useful before/after redesign is not just enlargement: before, twelve narrow columns with repeated labels; after, two six-column tables with the identifying column repeated. The second layout may remain readable on A4 without a foldout. Inspect both exported pages rather than assuming fewer sheets is better.

Acrobat auto-orientation can choose portrait or landscape per page, but that is different from a printer using different paper sizes. Send the page positions that need A3 and ask how they will be supplied or bound. The standard size selector should not be read as automatic mixed-size fulfilment.